package com.itheima.interceptor;

import com.alibaba.fastjson.JSONObject;
import com.itheima.pojo.Result;
import com.itheima.utils.JwtUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
@Slf4j
public class LoginCheckInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest req, HttpServletResponse resp, Object handler) throws Exception {

        //1.获取请求的url
        String url=req.getRequestURL().toString();
        log.info("请求的url:{}",url);
        //2.判断请求url是否包含login，如果包含，说明是登录操作，放行
        if(url.contains("login")){
            log.info("登录操作，放行。。。");
            return true;
        }
        //3.获取请求头中的令牌
        String jwt=req.getHeader("token");
        //4.判断令牌是否存在，如果不存在，返回错误结果
        if(!StringUtils.hasLength(jwt)){
            log.info("请求头token为空，返回未登录的信息");
            Result error=Result.error("NOT_LOGIN");
            String notLogin= JSONObject.toJSONString(error);
            resp.getWriter().write(notLogin);
            return false;
        }
        //5.解析令牌，如果解析失败，返回错误结果
        try{
            JwtUtils.parseJWT(jwt);
        }catch (Exception e){
            e.printStackTrace();
            log.info("解析令牌失败，返回未登录的错误信息");
            Result error=Result.error("NOT_LOGIN");
            String notLogin= JSONObject.toJSONString(error);
            resp.getWriter().write(notLogin);
            return false;
        }

        //6.放行
        log.info("令牌合法，放行");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle...");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion...");
    }
}
